摘要
原油族群划分可确定其与烃源岩的亲缘关系并指示油源区,为勘探和资源评价提供重要依据。利用气相色谱-质谱联用仪(GC-MS)对采自黔南坳陷古生界油苗及固体沥青样品进行生物标志物分析,并系统地研究了其地球化学和碳同位素特征。结果表明,油苗及固体沥青主要有2个族群,分别为奥陶系、志留系样品和二叠系样品,它们的DBT/P值、C21TT/C23TT值、C24FT/C26TT值、C30diaH/C30H值以及C27-C28-C29规则甾烷分布和碳同位素有较大差异,结合地质背景认为是由不同源岩贡献所致,奥陶系、志留系油苗及沥青分子地球化学特征与下寒武统烃源岩特征相似,而二叠系油苗及沥青可能为下二叠统烃源岩输入或混源。
Classification of crude oil families can be used to determine the relation with the source rock and to indicate the oil source, and also provides key information for exploration and resources assessment. This paper uses GC-MS to analyze the Paleozoic oil seepage and solid bitumen samples from the southern Guizhou Depression in their biological markers, and studies their characteristics of geochemistry and carbon isotope. Two families are classified, belonging to Ordovician and Silurian/Permian respectively. They are different in DBT/P, C21 TF/C23 TT, C24 FT/C26 TT, C30 diaH/ C30H, C27-C28-C29 sterane distribution and stable carbon isotope, which is contributed by different sources, combined with geological settings. The Ordovician and Silurian oil seepage and bitumen is identical with the lower Cambrian source rock in geochemistry, but the Permian samples may come from the lower Permian source rock or mixture.
出处
《资源与产业》
2014年第4期66-71,共6页
Resources & Industries
关键词
油苗
固体沥青
族群划分
GC—MS
黔南坳陷
oil seepage
solid bitumen
family classification
GC-MS
the southern Guizhou Depression
